George,
I could be wrong, but I imagine what ML meant by "those are not trophy BG" was that most people will not be catching trophy-sized BG at a feeder very often. Based on what I've seen at our BG pond, the mid-range BG disproportionately outnumber both the smaller BG and the trophy BG when taking the feed. Catching a trophy-sized BG by any method is tough enough, much less on a fly when "hundreds" of intermediate-sized BG are in a feeding frenzy.
That being said, if you catch trophy-SIZED BGs on a pellet fly that you thought of AND made yourself, then how could it not be considerd a "trophy," regardless of whether it was at the feeder? There's nothing wrong with adapting to what the BG are eating and adjusting your bait and presentation accordingly. That's just ingenuity. If anything, catching a trophy-sized BG would be more of what I would define as a "trophy" in such circumstances. That's because a "trophy" to me is more than just the size of the fish...it's the fact that you outsmarted a fish that defied the odds to get that big in the first place.